Become a part of the community. Register and take part in all the features the site has to offer.

Results 1 to 7 of 7
  1. #1
    Frequent Member
    Join Date
    May 2010
    Location
    jozi
    Age
    58
    Posts
    242
    Post Thanks / Like

    Default Nikon Creative Lighting System (CLS) How does it work?

    Everything you read about the CLS is about how amazing it is. I have been discussing this on another thread but want to hone into some specifics - and specifically the TTL settings.

    In principle as I understand it; the camera reads the light in the scene. Then communicates with all the off camera flashes with how much light they need to add to the scene to get the exposure you want - you set the ratios with the compensation settings.

    How does it do this? For example where is it getting the data. From the remote flashes? So what happens when the sensor window is pointing toward an umbrella (and has to because the trigger sensor has to face the commander unit) or when the flash is being bounced off a reflector or through a diffuser.

    If the camera is telling the flash when to switch off how does it do that in the very small time it has.

    I have read a lot - but most tell you how to set up - not this.

    Thank you.

  2. #2
    Frequent Member
    Join Date
    Feb 2006
    Location
    Centurion
    Age
    61
    Posts
    2,208
    Post Thanks / Like

    Default Re: Nikon Creative Lighting System (CLS) How does it work?

    Walter,

    I half-answered this in the 'other thread'

    But the CLS trick lies in the the pre-exposure flash. The commander fires a measuring flash, each group: A, B, C in succession. Using that information, the camera - not the flash- then calculates the ambient light exposure required as well as that required from each flash, with the compensation as you have set it, using iTTL. The commander then issues the flash command for groups A,B and C and they all fire together at the calculated power. And if your compensation was crooked - your images will b*ggered.

    This all is encoded in an IR stream of commands - and it works because the measurement it is a closed loop system. You must just assure that the flash can pick up the IR command stream, and it can be reflected! Best is if the small window on the side of the flash can see the IR stream from the commander. AS you know by now - a CLS commander can be the SU-800 or commander flash (pop-up or SB-6/7/900 and 910.

    When you issue manual flash commands for each group (M) by setting the power levels, it does just that - Simply fires the flash as you set it.

    I got a special model (Pop) in to understand CLS. It helped a lot. Results are here: http://www.pbase.com/leot/pop
    Best,

    Leo Theron
    ... see my pictures HERE

  3. #3
    Frequent Member Warren Williams's Avatar
    Join Date
    Jul 2006
    Location
    Kenton on Sea
    Age
    73
    Posts
    887
    Post Thanks / Like

    Default Re: Nikon Creative Lighting System (CLS) How does it work?

    If you go here you will find all the answers

    http://nikonclspracticalguide.blogspot.com/

  4. Likes JayPeeAre liked this post
  5. #4
    Frequent Member
    Join Date
    May 2010
    Location
    jozi
    Age
    58
    Posts
    242
    Post Thanks / Like

    Default Re: Nikon Creative Lighting System (CLS) How does it work?

    Quote Originally Posted by Leo Theron View Post
    Walter,

    I half-answered this in the 'other thread'

    I got a special model (Pop) in to understand CLS. It helped a lot. Results are here: http://www.pbase.com/leot/pop
    Thank you - that makes sense. I now understand.

  6. #5
    Frequent Member
    Join Date
    May 2010
    Location
    jozi
    Age
    58
    Posts
    242
    Post Thanks / Like

    Default Re: Nikon Creative Lighting System (CLS) How does it work?

    Quote Originally Posted by Warren Williams View Post
    If you go here you will find all the answers

    http://nikonclspracticalguide.blogspot.com/

    Thank you - I looked there and found some answers. I bought a book on the CLS - I didn't pick up this point. Blog 6 kind of explained. Will read the rest as well.

  7. #6
    Frequent Member
    Join Date
    May 2010
    Location
    jozi
    Age
    58
    Posts
    242
    Post Thanks / Like

    Default Re: Nikon Creative Lighting System (CLS) How does it work?

    Quote Originally Posted by walterpike View Post
    Thank you - that makes sense. I now understand.
    Leo - there was such a small gap in my knowledge, I have been playing around taking pictures of my mannequin head and quess what, it's working just fine, doing exactly what it supposed to do and I feel as confident as when I am using my studio monolights. Certainly for the portrait like pics I have been trying with. Thanks for the patience.

  8. #7
    Member JayPeeAre's Avatar
    Join Date
    Jul 2013
    Location
    Hilton
    Posts
    41
    Post Thanks / Like

    Default Re: Nikon Creative Lighting System (CLS) How does it work?

    Quote Originally Posted by Warren Williams View Post
    If you go here you will find all the answers

    http://nikonclspracticalguide.blogspot.com/
    very handy link, that!
    thank you.

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •